It looks like Starbucks will start offering a new way to pay for all that caffeine nationwide starting this week. Using an iPhone or Blackberry app called Starbucks Card Mobile, users will be able to use their phone as tender at 6,800 locations in the US. The app lets people add payment cards to it, and then simply scan their devices when they want to buy something. The program has been operating as a pilot at select locations, and the company believes customers will appreciate the easier and faster way to pay.